Scope and Contents Two autograph letters signed from Sir William Armstrong to Sir Charles Lyell.1. Letter dated 21 July 1863: "It will be quite convenient to receive you & Lady Lyell with her servant on the 29th Aug[us]t & Lady Armstrong and I hope you will not hesitate to come. I have several houses available for sleeping within a few hundred yards of my own & I have abundance of room in all other aspects [...]".2. Letter dated 29 August 1863: "I am very sorry that we are...